package com.hmdp.service.impl;

import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.hmdp.dto.Result;
import com.hmdp.entity.ShopType;
import com.hmdp.mapper.ShopTypeMapper;
import com.hmdp.service.IShopTypeService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

import java.util.ArrayList;
import java.util.List;

import static com.hmdp.utils.RedisConstants.CACHE_SHOP_TYPE_KEY;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopTypeServiceImpl extends ServiceImpl<ShopTypeMapper, ShopType> implements IShopTypeService {
    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result queryShopType() {
        //1.从redis中查询
        String key = CACHE_SHOP_TYPE_KEY;
    String Json = stringRedisTemplate.opsForValue().get( key);
    if(StrUtil.isNotBlank(Json)){
        //2.存在，直接返回
        List<ShopType> shopTypes = JSONUtil.toList(Json, ShopType.class);
        return Result.ok(shopTypes);

    }
    //3.不存在，根据id查询数据库
       List<ShopType> shopTypes = query().orderByAsc("sort").list();
    if(shopTypes==null){
        //4.不存在，返回错误
        return Result.fail("列表不存在");
    }
    stringRedisTemplate.opsForValue().set(key,JSONUtil.toJsonStr(shopTypes));
        return  Result.ok(shopTypes);

    }
}
